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• W2904683434 abstract "Optical charge state switching was previously observed in photoluminescence experiments for the divacancy defect in $4H$-SiC. The participating dark charge state could not be identified with certainty. We use constrained density-functional theory to investigate the mechanism of charge state conversion from the bright neutral charge state of the divacancy defect to the positive and negative charge states including corresponding recovery of the neutral charge state. While we can confirm that the positive charge state is dark, we do not find evidence that the negative charge state is dark. We compute similar absorption energies required for conversion of the neutral defect to both charge states. However, the formation of the positive charge state requires a series of excitations involving a 2-photon excitation, while the creation of the negative charge state is achieved through a single 2-photon process. Calculated absorption energies for the recovery of the neutral defect from the positive charge state fit the experimental value better than those from the negative charge state. Defect formation energies as a function of the Fermi energy show a very small Fermi energy range in which the negative charge state is most stable, while the positive charge state exhibits a wide stability range. Overall, our computational results give more support to the identification of the dark charge state as the positive over the negative charge state in the mechanism of optical charge state switching." @default.
• W2904683434 created "2018-12-22" @default.
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• W2904683434 date "2018-12-10" @default.
• W2904683434 modified "2023-10-16" @default.
• W2904683434 title "Charge state switching of the divacancy defect in 4H -SiC" @default.
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• W2904683434 doi "https://doi.org/10.1103/physrevb.98.214107" @default.
• W2904683434 hasPublicationYear "2018" @default.
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